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    <head>
      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [ms] clang-cl emits definitions for methods of inner classes of template classes of the template has a dllimported instantiation declaration"
   href="https://llvm.org/bugs/show_bug.cgi?id=27810">27810</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ms] clang-cl emits definitions for methods of inner classes of template classes of the template has a dllimported instantiation declaration
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>nicolasweber@gmx.de
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Consider:

template <class T>
struct basic_ostream {
  struct sentry {
    sentry() {
    }
  };
};
template class __declspec(dllimport) basic_ostream<char>;


clang-cl emits basic_ostream<char>::sentry::sentry() for this. cl doesn't.
clang doesn't emit anything if this is an "extern template class". dllimported
instantiation declarations should probably do something similar to extern
templates in non-microsoft mode.


This causes us to emit a bunch of functions into the .obj of every TU that
includes <ostream> with Microsoft's headers, making codegen slower than
necessary.</pre>
        </div>
      </p>
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